FN PS90 SBR 5.7x28mm, 10.4" Threaded Barrel, Bullpup, Design Machine RMR-Footprint Top Rail, 6x 50-Round Magazines
This FN PS90 short-barrel rifle stands out with its 10.4-inch threaded barrel, bottom ejection, and fully ambidextrous controls in a compact bullpup layout. It is customized with a Design Machine USA low-profile top rail featuring an RMR-pattern interface, and it comes with six 50-round translucent magazines plus additional included components.
Condition
Overall Condition: Very good condition, showing only light, superficial signs of prior handling or use.
Specific Condition Details: This firearm is in great shape. There are some minor and superficial scratches and blemishes present.
Bore Overall Condition: Excellent - Clean, mirror finish, no signs of wear.
Bore Rifling: Excellent Rifling - Sharp lands and grooves.
What’s Included
- FN PS90 SBR chambered in 5.7x28mm with 10.4" threaded barrel
- 6x 50-round translucent PS90/P90-pattern top-feed magazines
- Design Machine USA RMR-pattern low-profile top rail assembly (installed)
- Top Picatinny rail, long style (detached)
- Detachable multi-port muzzle device (not installed)
The PS90’s bullpup design delivers a compact package while keeping a 13.5" length of pull. It feeds from top-mounted translucent 50-round magazines and ejects downward, making it practical for both left- and right-handed users.
Controls are fully ambidextrous, including the magazine release and dual charging handles, with a cross-bolt safety positioned for straightforward operation. The rifle uses a straight blowback action tailored to the 5.7x28mm cartridge.
This SBR configuration features a 10.4" barrel with threading for the included multi-port muzzle device. The polymer stock integrates a thumbhole-style grip and right-side front sling loop, while a steel receiver provides durability.
A Design Machine USA low-profile top rail with an RMR-pattern interface is installed, offering a streamlined mounting platform along with short side rail segments. Additional markings include Fabrique Nationale Herstal BELGIUM, FN COLUMBIA SC, and Shiu Waco, TX. The serial number is located on the left front of the barrel support.